Buffett did a series of interviews before a cardboard BNSF locomotive Saturday morning, played with a model BNSF train and performed a version of ``I'll Be Working on the Railroad'' before the meeting.

Buffett and his partner Charlie Munger will spend more than five hours answering questions from roughly 40,000 people.

Buffett says he believes BNSF is a big, solid business that will deliver good returns over the long-term. Berkshire spent $26.7 billion on the railroad earlier this year.

Buffett played his ukulele with the Quebe Sisters Band at the Justin Boots booth before heading backstage.